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1511 lines
26 KiB
C
1511 lines
26 KiB
C
/*
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* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
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*
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* Copyright (C) 2002-2007 Aleph One Ltd.
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* for Toby Churchill Ltd and Brightstar Engineering
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*
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* Created by Charles Manning <charles@aleph1.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* XXX U-BOOT XXX */
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#include <common.h>
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#include <malloc.h>
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#include "yaffsfs.h"
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#include "yaffs_guts.h"
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#include "yaffscfg.h"
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#include "yportenv.h"
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/* XXX U-BOOT XXX */
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#if 0
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#include <string.h> // for memset
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#endif
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#define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
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#ifndef NULL
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#define NULL ((void *)0)
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#endif
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const char *yaffsfs_c_version="$Id: yaffsfs.c,v 1.18 2007/07/18 19:40:38 charles Exp $";
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// configurationList is the list of devices that are supported
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static yaffsfs_DeviceConfiguration *yaffsfs_configurationList;
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/* Some forward references */
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static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path, int symDepth);
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static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj);
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// Handle management.
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//
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unsigned int yaffs_wr_attempts;
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typedef struct
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{
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__u8 inUse:1; // this handle is in use
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__u8 readOnly:1; // this handle is read only
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__u8 append:1; // append only
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__u8 exclusive:1; // exclusive
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__u32 position; // current position in file
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yaffs_Object *obj; // the object
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}yaffsfs_Handle;
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static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
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// yaffsfs_InitHandle
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/// Inilitalise handles on start-up.
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//
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static int yaffsfs_InitHandles(void)
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{
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int i;
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for(i = 0; i < YAFFSFS_N_HANDLES; i++)
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{
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yaffsfs_handle[i].inUse = 0;
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yaffsfs_handle[i].obj = NULL;
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}
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return 0;
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}
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yaffsfs_Handle *yaffsfs_GetHandlePointer(int h)
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{
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if(h < 0 || h >= YAFFSFS_N_HANDLES)
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{
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return NULL;
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}
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return &yaffsfs_handle[h];
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}
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yaffs_Object *yaffsfs_GetHandleObject(int handle)
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{
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yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
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if(h && h->inUse)
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{
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return h->obj;
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}
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return NULL;
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}
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//yaffsfs_GetHandle
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// Grab a handle (when opening a file)
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//
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static int yaffsfs_GetHandle(void)
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{
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int i;
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yaffsfs_Handle *h;
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for(i = 0; i < YAFFSFS_N_HANDLES; i++)
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{
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h = yaffsfs_GetHandlePointer(i);
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if(!h)
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{
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// todo bug: should never happen
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}
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if(!h->inUse)
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{
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memset(h,0,sizeof(yaffsfs_Handle));
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h->inUse=1;
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return i;
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}
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}
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return -1;
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}
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// yaffs_PutHandle
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// Let go of a handle (when closing a file)
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//
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static int yaffsfs_PutHandle(int handle)
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{
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yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
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if(h)
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{
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h->inUse = 0;
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h->obj = NULL;
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}
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return 0;
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}
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// Stuff to search for a directory from a path
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int yaffsfs_Match(char a, char b)
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{
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// case sensitive
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return (a == b);
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}
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// yaffsfs_FindDevice
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// yaffsfs_FindRoot
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// Scan the configuration list to find the root.
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// Curveballs: Should match paths that end in '/' too
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// Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
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static yaffs_Device *yaffsfs_FindDevice(const char *path, char **restOfPath)
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{
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yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList;
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const char *leftOver;
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const char *p;
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yaffs_Device *retval = NULL;
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int thisMatchLength;
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int longestMatch = -1;
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// Check all configs, choose the one that:
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// 1) Actually matches a prefix (ie /a amd /abc will not match
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// 2) Matches the longest.
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while(cfg && cfg->prefix && cfg->dev)
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{
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leftOver = path;
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p = cfg->prefix;
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thisMatchLength = 0;
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while(*p && //unmatched part of prefix
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strcmp(p,"/") && // the rest of the prefix is not / (to catch / at end)
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*leftOver &&
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yaffsfs_Match(*p,*leftOver))
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{
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p++;
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leftOver++;
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thisMatchLength++;
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}
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if((!*p || strcmp(p,"/") == 0) && // end of prefix
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(!*leftOver || *leftOver == '/') && // no more in this path name part
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(thisMatchLength > longestMatch))
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{
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// Matched prefix
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*restOfPath = (char *)leftOver;
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retval = cfg->dev;
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longestMatch = thisMatchLength;
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}
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cfg++;
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}
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return retval;
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}
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static yaffs_Object *yaffsfs_FindRoot(const char *path, char **restOfPath)
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{
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yaffs_Device *dev;
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dev= yaffsfs_FindDevice(path,restOfPath);
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if(dev && dev->isMounted)
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{
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return dev->rootDir;
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}
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return NULL;
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}
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static yaffs_Object *yaffsfs_FollowLink(yaffs_Object *obj,int symDepth)
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{
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while(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
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{
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char *alias = obj->variant.symLinkVariant.alias;
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if(*alias == '/')
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{
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// Starts with a /, need to scan from root up
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obj = yaffsfs_FindObject(NULL,alias,symDepth++);
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}
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else
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{
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// Relative to here, so use the parent of the symlink as a start
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obj = yaffsfs_FindObject(obj->parent,alias,symDepth++);
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}
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}
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return obj;
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}
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// yaffsfs_FindDirectory
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// Parse a path to determine the directory and the name within the directory.
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//
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// eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
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static yaffs_Object *yaffsfs_DoFindDirectory(yaffs_Object *startDir,const char *path,char **name,int symDepth)
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{
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yaffs_Object *dir;
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char *restOfPath;
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char str[YAFFS_MAX_NAME_LENGTH+1];
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int i;
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if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES)
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{
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return NULL;
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}
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if(startDir)
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{
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dir = startDir;
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restOfPath = (char *)path;
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}
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else
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{
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dir = yaffsfs_FindRoot(path,&restOfPath);
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}
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while(dir)
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{
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// parse off /.
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// curve ball: also throw away surplus '/'
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// eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
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while(*restOfPath == '/')
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{
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restOfPath++; // get rid of '/'
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}
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*name = restOfPath;
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i = 0;
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while(*restOfPath && *restOfPath != '/')
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{
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if (i < YAFFS_MAX_NAME_LENGTH)
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{
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str[i] = *restOfPath;
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str[i+1] = '\0';
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i++;
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}
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restOfPath++;
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}
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if(!*restOfPath)
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{
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// got to the end of the string
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return dir;
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}
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else
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{
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if(strcmp(str,".") == 0)
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{
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// Do nothing
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}
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else if(strcmp(str,"..") == 0)
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{
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dir = dir->parent;
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}
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else
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{
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dir = yaffs_FindObjectByName(dir,str);
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while(dir && dir->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
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{
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dir = yaffsfs_FollowLink(dir,symDepth);
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}
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if(dir && dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
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{
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dir = NULL;
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}
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}
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}
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}
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// directory did not exist.
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return NULL;
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}
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static yaffs_Object *yaffsfs_FindDirectory(yaffs_Object *relativeDirectory,const char *path,char **name,int symDepth)
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{
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return yaffsfs_DoFindDirectory(relativeDirectory,path,name,symDepth);
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}
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// yaffsfs_FindObject turns a path for an existing object into the object
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//
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static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path,int symDepth)
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{
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yaffs_Object *dir;
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char *name;
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dir = yaffsfs_FindDirectory(relativeDirectory,path,&name,symDepth);
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if(dir && *name)
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{
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return yaffs_FindObjectByName(dir,name);
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}
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return dir;
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}
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int yaffs_open(const char *path, int oflag, int mode)
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{
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yaffs_Object *obj = NULL;
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yaffs_Object *dir = NULL;
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char *name;
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int handle = -1;
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yaffsfs_Handle *h = NULL;
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int alreadyOpen = 0;
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int alreadyExclusive = 0;
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int openDenied = 0;
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int symDepth = 0;
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int errorReported = 0;
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int i;
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// todo sanity check oflag (eg. can't have O_TRUNC without WRONLY or RDWR
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yaffsfs_Lock();
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handle = yaffsfs_GetHandle();
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if(handle >= 0)
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{
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h = yaffsfs_GetHandlePointer(handle);
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// try to find the exisiting object
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obj = yaffsfs_FindObject(NULL,path,0);
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if(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
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{
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obj = yaffsfs_FollowLink(obj,symDepth++);
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}
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if(obj)
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{
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// Check if the object is already in use
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alreadyOpen = alreadyExclusive = 0;
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for(i = 0; i <= YAFFSFS_N_HANDLES; i++)
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{
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if(i != handle &&
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yaffsfs_handle[i].inUse &&
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obj == yaffsfs_handle[i].obj)
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{
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alreadyOpen = 1;
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if(yaffsfs_handle[i].exclusive)
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{
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alreadyExclusive = 1;
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}
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}
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}
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if(((oflag & O_EXCL) && alreadyOpen) || alreadyExclusive)
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{
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openDenied = 1;
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}
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// Open should fail if O_CREAT and O_EXCL are specified
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if((oflag & O_EXCL) && (oflag & O_CREAT))
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{
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openDenied = 1;
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yaffsfs_SetError(-EEXIST);
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errorReported = 1;
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}
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// Check file permissions
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if( (oflag & (O_RDWR | O_WRONLY)) == 0 && // ie O_RDONLY
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!(obj->yst_mode & S_IREAD))
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{
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openDenied = 1;
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}
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if( (oflag & O_RDWR) &&
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!(obj->yst_mode & S_IREAD))
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{
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openDenied = 1;
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}
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if( (oflag & (O_RDWR | O_WRONLY)) &&
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!(obj->yst_mode & S_IWRITE))
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{
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openDenied = 1;
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}
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}
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else if((oflag & O_CREAT))
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{
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// Let's see if we can create this file
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dir = yaffsfs_FindDirectory(NULL,path,&name,0);
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if(dir)
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{
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obj = yaffs_MknodFile(dir,name,mode,0,0);
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}
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else
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{
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yaffsfs_SetError(-ENOTDIR);
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}
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}
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if(obj && !openDenied)
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{
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h->obj = obj;
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h->inUse = 1;
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h->readOnly = (oflag & (O_WRONLY | O_RDWR)) ? 0 : 1;
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h->append = (oflag & O_APPEND) ? 1 : 0;
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h->exclusive = (oflag & O_EXCL) ? 1 : 0;
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h->position = 0;
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obj->inUse++;
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if((oflag & O_TRUNC) && !h->readOnly)
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{
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//todo truncate
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yaffs_ResizeFile(obj,0);
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}
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}
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else
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{
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yaffsfs_PutHandle(handle);
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if(!errorReported)
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{
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yaffsfs_SetError(-EACCESS);
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errorReported = 1;
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}
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handle = -1;
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}
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}
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yaffsfs_Unlock();
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return handle;
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}
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int yaffs_close(int fd)
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{
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yaffsfs_Handle *h = NULL;
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int retVal = 0;
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yaffsfs_Lock();
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h = yaffsfs_GetHandlePointer(fd);
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if(h && h->inUse)
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{
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// clean up
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yaffs_FlushFile(h->obj,1);
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h->obj->inUse--;
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if(h->obj->inUse <= 0 && h->obj->unlinked)
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{
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yaffs_DeleteFile(h->obj);
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}
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yaffsfs_PutHandle(fd);
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retVal = 0;
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}
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else
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{
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// bad handle
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yaffsfs_SetError(-EBADF);
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retVal = -1;
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}
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yaffsfs_Unlock();
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return retVal;
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}
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int yaffs_read(int fd, void *buf, unsigned int nbyte)
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{
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yaffsfs_Handle *h = NULL;
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yaffs_Object *obj = NULL;
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int pos = 0;
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int nRead = -1;
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int maxRead;
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yaffsfs_Lock();
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h = yaffsfs_GetHandlePointer(fd);
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obj = yaffsfs_GetHandleObject(fd);
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if(!h || !obj)
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{
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// bad handle
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yaffsfs_SetError(-EBADF);
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}
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else if( h && obj)
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{
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pos= h->position;
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if(yaffs_GetObjectFileLength(obj) > pos)
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{
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maxRead = yaffs_GetObjectFileLength(obj) - pos;
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}
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else
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{
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maxRead = 0;
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}
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if(nbyte > maxRead)
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{
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nbyte = maxRead;
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}
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if(nbyte > 0)
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{
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nRead = yaffs_ReadDataFromFile(obj,buf,pos,nbyte);
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if(nRead >= 0)
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{
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h->position = pos + nRead;
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}
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else
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{
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//todo error
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}
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}
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else
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{
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nRead = 0;
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}
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}
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yaffsfs_Unlock();
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return (nRead >= 0) ? nRead : -1;
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}
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int yaffs_write(int fd, const void *buf, unsigned int nbyte)
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{
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yaffsfs_Handle *h = NULL;
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yaffs_Object *obj = NULL;
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int pos = 0;
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int nWritten = -1;
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int writeThrough = 0;
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yaffsfs_Lock();
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h = yaffsfs_GetHandlePointer(fd);
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obj = yaffsfs_GetHandleObject(fd);
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if(!h || !obj)
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{
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// bad handle
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yaffsfs_SetError(-EBADF);
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}
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else if( h && obj && h->readOnly)
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{
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// todo error
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}
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else if( h && obj)
|
|
{
|
|
if(h->append)
|
|
{
|
|
pos = yaffs_GetObjectFileLength(obj);
|
|
}
|
|
else
|
|
{
|
|
pos = h->position;
|
|
}
|
|
|
|
nWritten = yaffs_WriteDataToFile(obj,buf,pos,nbyte,writeThrough);
|
|
|
|
if(nWritten >= 0)
|
|
{
|
|
h->position = pos + nWritten;
|
|
}
|
|
else
|
|
{
|
|
//todo error
|
|
}
|
|
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
|
|
return (nWritten >= 0) ? nWritten : -1;
|
|
|
|
}
|
|
|
|
int yaffs_truncate(int fd, off_t newSize)
|
|
{
|
|
yaffsfs_Handle *h = NULL;
|
|
yaffs_Object *obj = NULL;
|
|
int result = 0;
|
|
|
|
yaffsfs_Lock();
|
|
h = yaffsfs_GetHandlePointer(fd);
|
|
obj = yaffsfs_GetHandleObject(fd);
|
|
|
|
if(!h || !obj)
|
|
{
|
|
// bad handle
|
|
yaffsfs_SetError(-EBADF);
|
|
}
|
|
else
|
|
{
|
|
// resize the file
|
|
result = yaffs_ResizeFile(obj,newSize);
|
|
}
|
|
yaffsfs_Unlock();
|
|
|
|
|
|
return (result) ? 0 : -1;
|
|
|
|
}
|
|
|
|
off_t yaffs_lseek(int fd, off_t offset, int whence)
|
|
{
|
|
yaffsfs_Handle *h = NULL;
|
|
yaffs_Object *obj = NULL;
|
|
int pos = -1;
|
|
int fSize = -1;
|
|
|
|
yaffsfs_Lock();
|
|
h = yaffsfs_GetHandlePointer(fd);
|
|
obj = yaffsfs_GetHandleObject(fd);
|
|
|
|
if(!h || !obj)
|
|
{
|
|
// bad handle
|
|
yaffsfs_SetError(-EBADF);
|
|
}
|
|
else if(whence == SEEK_SET)
|
|
{
|
|
if(offset >= 0)
|
|
{
|
|
pos = offset;
|
|
}
|
|
}
|
|
else if(whence == SEEK_CUR)
|
|
{
|
|
if( (h->position + offset) >= 0)
|
|
{
|
|
pos = (h->position + offset);
|
|
}
|
|
}
|
|
else if(whence == SEEK_END)
|
|
{
|
|
fSize = yaffs_GetObjectFileLength(obj);
|
|
if(fSize >= 0 && (fSize + offset) >= 0)
|
|
{
|
|
pos = fSize + offset;
|
|
}
|
|
}
|
|
|
|
if(pos >= 0)
|
|
{
|
|
h->position = pos;
|
|
}
|
|
else
|
|
{
|
|
// todo error
|
|
}
|
|
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
return pos;
|
|
}
|
|
|
|
|
|
int yaffsfs_DoUnlink(const char *path,int isDirectory)
|
|
{
|
|
yaffs_Object *dir = NULL;
|
|
yaffs_Object *obj = NULL;
|
|
char *name;
|
|
int result = YAFFS_FAIL;
|
|
|
|
yaffsfs_Lock();
|
|
|
|
obj = yaffsfs_FindObject(NULL,path,0);
|
|
dir = yaffsfs_FindDirectory(NULL,path,&name,0);
|
|
if(!dir)
|
|
{
|
|
yaffsfs_SetError(-ENOTDIR);
|
|
}
|
|
else if(!obj)
|
|
{
|
|
yaffsfs_SetError(-ENOENT);
|
|
}
|
|
else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
|
|
{
|
|
yaffsfs_SetError(-EISDIR);
|
|
}
|
|
else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
|
|
{
|
|
yaffsfs_SetError(-ENOTDIR);
|
|
}
|
|
else
|
|
{
|
|
result = yaffs_Unlink(dir,name);
|
|
|
|
if(result == YAFFS_FAIL && isDirectory)
|
|
{
|
|
yaffsfs_SetError(-ENOTEMPTY);
|
|
}
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
// todo error
|
|
|
|
return (result == YAFFS_FAIL) ? -1 : 0;
|
|
}
|
|
int yaffs_rmdir(const char *path)
|
|
{
|
|
return yaffsfs_DoUnlink(path,1);
|
|
}
|
|
|
|
int yaffs_unlink(const char *path)
|
|
{
|
|
return yaffsfs_DoUnlink(path,0);
|
|
}
|
|
|
|
int yaffs_rename(const char *oldPath, const char *newPath)
|
|
{
|
|
yaffs_Object *olddir = NULL;
|
|
yaffs_Object *newdir = NULL;
|
|
yaffs_Object *obj = NULL;
|
|
char *oldname;
|
|
char *newname;
|
|
int result= YAFFS_FAIL;
|
|
int renameAllowed = 1;
|
|
|
|
yaffsfs_Lock();
|
|
|
|
olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
|
|
newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
|
|
obj = yaffsfs_FindObject(NULL,oldPath,0);
|
|
|
|
if(!olddir || !newdir || !obj)
|
|
{
|
|
// bad file
|
|
yaffsfs_SetError(-EBADF);
|
|
renameAllowed = 0;
|
|
}
|
|
else if(olddir->myDev != newdir->myDev)
|
|
{
|
|
// oops must be on same device
|
|
// todo error
|
|
yaffsfs_SetError(-EXDEV);
|
|
renameAllowed = 0;
|
|
}
|
|
else if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
|
|
{
|
|
// It is a directory, check that it is not being renamed to
|
|
// being its own decendent.
|
|
// Do this by tracing from the new directory back to the root, checking for obj
|
|
|
|
yaffs_Object *xx = newdir;
|
|
|
|
while( renameAllowed && xx)
|
|
{
|
|
if(xx == obj)
|
|
{
|
|
renameAllowed = 0;
|
|
}
|
|
xx = xx->parent;
|
|
}
|
|
if(!renameAllowed) yaffsfs_SetError(-EACCESS);
|
|
}
|
|
|
|
if(renameAllowed)
|
|
{
|
|
result = yaffs_RenameObject(olddir,oldname,newdir,newname);
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
return (result == YAFFS_FAIL) ? -1 : 0;
|
|
}
|
|
|
|
|
|
static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
|
|
{
|
|
int retVal = -1;
|
|
|
|
if(obj)
|
|
{
|
|
obj = yaffs_GetEquivalentObject(obj);
|
|
}
|
|
|
|
if(obj && buf)
|
|
{
|
|
buf->st_dev = (int)obj->myDev->genericDevice;
|
|
buf->st_ino = obj->objectId;
|
|
buf->st_mode = obj->yst_mode & ~S_IFMT; // clear out file type bits
|
|
|
|
if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
|
|
{
|
|
buf->st_mode |= S_IFDIR;
|
|
}
|
|
else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
|
|
{
|
|
buf->st_mode |= S_IFLNK;
|
|
}
|
|
else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
|
|
{
|
|
buf->st_mode |= S_IFREG;
|
|
}
|
|
|
|
buf->st_nlink = yaffs_GetObjectLinkCount(obj);
|
|
buf->st_uid = 0;
|
|
buf->st_gid = 0;;
|
|
buf->st_rdev = obj->yst_rdev;
|
|
buf->st_size = yaffs_GetObjectFileLength(obj);
|
|
buf->st_blksize = obj->myDev->nDataBytesPerChunk;
|
|
buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
|
|
buf->yst_atime = obj->yst_atime;
|
|
buf->yst_ctime = obj->yst_ctime;
|
|
buf->yst_mtime = obj->yst_mtime;
|
|
retVal = 0;
|
|
}
|
|
return retVal;
|
|
}
|
|
|
|
static int yaffsfs_DoStatOrLStat(const char *path, struct yaffs_stat *buf,int doLStat)
|
|
{
|
|
yaffs_Object *obj;
|
|
|
|
int retVal = -1;
|
|
|
|
yaffsfs_Lock();
|
|
obj = yaffsfs_FindObject(NULL,path,0);
|
|
|
|
if(!doLStat && obj)
|
|
{
|
|
obj = yaffsfs_FollowLink(obj,0);
|
|
}
|
|
|
|
if(obj)
|
|
{
|
|
retVal = yaffsfs_DoStat(obj,buf);
|
|
}
|
|
else
|
|
{
|
|
// todo error not found
|
|
yaffsfs_SetError(-ENOENT);
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
return retVal;
|
|
|
|
}
|
|
|
|
int yaffs_stat(const char *path, struct yaffs_stat *buf)
|
|
{
|
|
return yaffsfs_DoStatOrLStat(path,buf,0);
|
|
}
|
|
|
|
int yaffs_lstat(const char *path, struct yaffs_stat *buf)
|
|
{
|
|
return yaffsfs_DoStatOrLStat(path,buf,1);
|
|
}
|
|
|
|
int yaffs_fstat(int fd, struct yaffs_stat *buf)
|
|
{
|
|
yaffs_Object *obj;
|
|
|
|
int retVal = -1;
|
|
|
|
yaffsfs_Lock();
|
|
obj = yaffsfs_GetHandleObject(fd);
|
|
|
|
if(obj)
|
|
{
|
|
retVal = yaffsfs_DoStat(obj,buf);
|
|
}
|
|
else
|
|
{
|
|
// bad handle
|
|
yaffsfs_SetError(-EBADF);
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
return retVal;
|
|
}
|
|
|
|
static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
|
|
{
|
|
int result = YAFFS_FAIL;
|
|
|
|
if(obj)
|
|
{
|
|
obj = yaffs_GetEquivalentObject(obj);
|
|
}
|
|
|
|
if(obj)
|
|
{
|
|
obj->yst_mode = mode;
|
|
obj->dirty = 1;
|
|
result = yaffs_FlushFile(obj,0);
|
|
}
|
|
|
|
return result == YAFFS_OK ? 0 : -1;
|
|
}
|
|
|
|
|
|
int yaffs_chmod(const char *path, mode_t mode)
|
|
{
|
|
yaffs_Object *obj;
|
|
|
|
int retVal = -1;
|
|
|
|
yaffsfs_Lock();
|
|
obj = yaffsfs_FindObject(NULL,path,0);
|
|
|
|
if(obj)
|
|
{
|
|
retVal = yaffsfs_DoChMod(obj,mode);
|
|
}
|
|
else
|
|
{
|
|
// todo error not found
|
|
yaffsfs_SetError(-ENOENT);
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
return retVal;
|
|
|
|
}
|
|
|
|
|
|
int yaffs_fchmod(int fd, mode_t mode)
|
|
{
|
|
yaffs_Object *obj;
|
|
|
|
int retVal = -1;
|
|
|
|
yaffsfs_Lock();
|
|
obj = yaffsfs_GetHandleObject(fd);
|
|
|
|
if(obj)
|
|
{
|
|
retVal = yaffsfs_DoChMod(obj,mode);
|
|
}
|
|
else
|
|
{
|
|
// bad handle
|
|
yaffsfs_SetError(-EBADF);
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
return retVal;
|
|
}
|
|
|
|
|
|
int yaffs_mkdir(const char *path, mode_t mode)
|
|
{
|
|
yaffs_Object *parent = NULL;
|
|
yaffs_Object *dir = NULL;
|
|
char *name;
|
|
int retVal= -1;
|
|
|
|
yaffsfs_Lock();
|
|
parent = yaffsfs_FindDirectory(NULL,path,&name,0);
|
|
if(parent)
|
|
dir = yaffs_MknodDirectory(parent,name,mode,0,0);
|
|
if(dir)
|
|
{
|
|
retVal = 0;
|
|
}
|
|
else
|
|
{
|
|
yaffsfs_SetError(-ENOSPC); // just assume no space for now
|
|
retVal = -1;
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
return retVal;
|
|
}
|
|
|
|
int yaffs_mount(const char *path)
|
|
{
|
|
int retVal=-1;
|
|
int result=YAFFS_FAIL;
|
|
yaffs_Device *dev=NULL;
|
|
char *dummy;
|
|
|
|
T(YAFFS_TRACE_ALWAYS,("yaffs: Mounting %s\n",path));
|
|
|
|
yaffsfs_Lock();
|
|
dev = yaffsfs_FindDevice(path,&dummy);
|
|
if(dev)
|
|
{
|
|
if(!dev->isMounted)
|
|
{
|
|
result = yaffs_GutsInitialise(dev);
|
|
if(result == YAFFS_FAIL)
|
|
{
|
|
// todo error - mount failed
|
|
yaffsfs_SetError(-ENOMEM);
|
|
}
|
|
retVal = result ? 0 : -1;
|
|
|
|
}
|
|
else
|
|
{
|
|
//todo error - already mounted.
|
|
yaffsfs_SetError(-EBUSY);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// todo error - no device
|
|
yaffsfs_SetError(-ENODEV);
|
|
}
|
|
yaffsfs_Unlock();
|
|
return retVal;
|
|
|
|
}
|
|
|
|
int yaffs_unmount(const char *path)
|
|
{
|
|
int retVal=-1;
|
|
yaffs_Device *dev=NULL;
|
|
char *dummy;
|
|
|
|
yaffsfs_Lock();
|
|
dev = yaffsfs_FindDevice(path,&dummy);
|
|
if(dev)
|
|
{
|
|
if(dev->isMounted)
|
|
{
|
|
int i;
|
|
int inUse;
|
|
|
|
yaffs_FlushEntireDeviceCache(dev);
|
|
yaffs_CheckpointSave(dev);
|
|
|
|
for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++)
|
|
{
|
|
if(yaffsfs_handle[i].inUse && yaffsfs_handle[i].obj->myDev == dev)
|
|
{
|
|
inUse = 1; // the device is in use, can't unmount
|
|
}
|
|
}
|
|
|
|
if(!inUse)
|
|
{
|
|
yaffs_Deinitialise(dev);
|
|
|
|
retVal = 0;
|
|
}
|
|
else
|
|
{
|
|
// todo error can't unmount as files are open
|
|
yaffsfs_SetError(-EBUSY);
|
|
}
|
|
|
|
}
|
|
else
|
|
{
|
|
//todo error - not mounted.
|
|
yaffsfs_SetError(-EINVAL);
|
|
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// todo error - no device
|
|
yaffsfs_SetError(-ENODEV);
|
|
}
|
|
yaffsfs_Unlock();
|
|
return retVal;
|
|
|
|
}
|
|
|
|
loff_t yaffs_freespace(const char *path)
|
|
{
|
|
loff_t retVal=-1;
|
|
yaffs_Device *dev=NULL;
|
|
char *dummy;
|
|
|
|
yaffsfs_Lock();
|
|
dev = yaffsfs_FindDevice(path,&dummy);
|
|
if(dev && dev->isMounted)
|
|
{
|
|
retVal = yaffs_GetNumberOfFreeChunks(dev);
|
|
retVal *= dev->nDataBytesPerChunk;
|
|
|
|
}
|
|
else
|
|
{
|
|
yaffsfs_SetError(-EINVAL);
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
return retVal;
|
|
}
|
|
|
|
|
|
|
|
void yaffs_initialise(yaffsfs_DeviceConfiguration *cfgList)
|
|
{
|
|
|
|
yaffsfs_DeviceConfiguration *cfg;
|
|
|
|
yaffsfs_configurationList = cfgList;
|
|
|
|
yaffsfs_InitHandles();
|
|
|
|
cfg = yaffsfs_configurationList;
|
|
|
|
while(cfg && cfg->prefix && cfg->dev)
|
|
{
|
|
cfg->dev->isMounted = 0;
|
|
cfg->dev->removeObjectCallback = yaffsfs_RemoveObjectCallback;
|
|
cfg++;
|
|
}
|
|
}
|
|
|
|
|
|
//
|
|
// Directory search stuff.
|
|
|
|
//
|
|
// Directory search context
|
|
//
|
|
// NB this is an opaque structure.
|
|
|
|
|
|
typedef struct
|
|
{
|
|
__u32 magic;
|
|
yaffs_dirent de; /* directory entry being used by this dsc */
|
|
char name[NAME_MAX+1]; /* name of directory being searched */
|
|
yaffs_Object *dirObj; /* ptr to directory being searched */
|
|
yaffs_Object *nextReturn; /* obj to be returned by next readddir */
|
|
int offset;
|
|
struct list_head others;
|
|
} yaffsfs_DirectorySearchContext;
|
|
|
|
|
|
|
|
static struct list_head search_contexts;
|
|
|
|
|
|
static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc)
|
|
{
|
|
if(dsc &&
|
|
dsc->dirObj &&
|
|
dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
|
|
|
|
dsc->offset = 0;
|
|
|
|
if( list_empty(&dsc->dirObj->variant.directoryVariant.children)){
|
|
dsc->nextReturn = NULL;
|
|
} else {
|
|
dsc->nextReturn = list_entry(dsc->dirObj->variant.directoryVariant.children.next,
|
|
yaffs_Object,siblings);
|
|
}
|
|
} else {
|
|
/* Hey someone isn't playing nice! */
|
|
}
|
|
}
|
|
|
|
static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc)
|
|
{
|
|
if(dsc &&
|
|
dsc->dirObj &&
|
|
dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
|
|
|
|
if( dsc->nextReturn == NULL ||
|
|
list_empty(&dsc->dirObj->variant.directoryVariant.children)){
|
|
dsc->nextReturn = NULL;
|
|
} else {
|
|
struct list_head *next = dsc->nextReturn->siblings.next;
|
|
|
|
if( next == &dsc->dirObj->variant.directoryVariant.children)
|
|
dsc->nextReturn = NULL; /* end of list */
|
|
else
|
|
dsc->nextReturn = list_entry(next,yaffs_Object,siblings);
|
|
}
|
|
} else {
|
|
/* Hey someone isn't playing nice! */
|
|
}
|
|
}
|
|
|
|
static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj)
|
|
{
|
|
|
|
struct list_head *i;
|
|
yaffsfs_DirectorySearchContext *dsc;
|
|
|
|
/* if search contexts not initilised then skip */
|
|
if(!search_contexts.next)
|
|
return;
|
|
|
|
/* Iteratethrough the directory search contexts.
|
|
* If any are the one being removed, then advance the dsc to
|
|
* the next one to prevent a hanging ptr.
|
|
*/
|
|
list_for_each(i, &search_contexts) {
|
|
if (i) {
|
|
dsc = list_entry(i, yaffsfs_DirectorySearchContext,others);
|
|
if(dsc->nextReturn == obj)
|
|
yaffsfs_DirAdvance(dsc);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
yaffs_DIR *yaffs_opendir(const char *dirname)
|
|
{
|
|
yaffs_DIR *dir = NULL;
|
|
yaffs_Object *obj = NULL;
|
|
yaffsfs_DirectorySearchContext *dsc = NULL;
|
|
|
|
yaffsfs_Lock();
|
|
|
|
obj = yaffsfs_FindObject(NULL,dirname,0);
|
|
|
|
if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
|
|
{
|
|
|
|
dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
|
|
dir = (yaffs_DIR *)dsc;
|
|
if(dsc)
|
|
{
|
|
memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext));
|
|
dsc->magic = YAFFS_MAGIC;
|
|
dsc->dirObj = obj;
|
|
strncpy(dsc->name,dirname,NAME_MAX);
|
|
INIT_LIST_HEAD(&dsc->others);
|
|
|
|
if(!search_contexts.next)
|
|
INIT_LIST_HEAD(&search_contexts);
|
|
|
|
list_add(&dsc->others,&search_contexts);
|
|
yaffsfs_SetDirRewound(dsc); }
|
|
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
return dir;
|
|
}
|
|
|
|
struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
|
|
{
|
|
yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
|
|
struct yaffs_dirent *retVal = NULL;
|
|
|
|
yaffsfs_Lock();
|
|
|
|
if(dsc && dsc->magic == YAFFS_MAGIC){
|
|
yaffsfs_SetError(0);
|
|
if(dsc->nextReturn){
|
|
dsc->de.d_ino = yaffs_GetEquivalentObject(dsc->nextReturn)->objectId;
|
|
dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
|
|
dsc->de.d_off = dsc->offset++;
|
|
yaffs_GetObjectName(dsc->nextReturn,dsc->de.d_name,NAME_MAX);
|
|
if(strlen(dsc->de.d_name) == 0)
|
|
{
|
|
// this should not happen!
|
|
strcpy(dsc->de.d_name,"zz");
|
|
}
|
|
dsc->de.d_reclen = sizeof(struct yaffs_dirent);
|
|
retVal = &dsc->de;
|
|
yaffsfs_DirAdvance(dsc);
|
|
} else
|
|
retVal = NULL;
|
|
}
|
|
else
|
|
{
|
|
yaffsfs_SetError(-EBADF);
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
return retVal;
|
|
|
|
}
|
|
|
|
|
|
void yaffs_rewinddir(yaffs_DIR *dirp)
|
|
{
|
|
yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
|
|
|
|
yaffsfs_Lock();
|
|
|
|
yaffsfs_SetDirRewound(dsc);
|
|
|
|
yaffsfs_Unlock();
|
|
}
|
|
|
|
|
|
int yaffs_closedir(yaffs_DIR *dirp)
|
|
{
|
|
yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
|
|
|
|
yaffsfs_Lock();
|
|
dsc->magic = 0;
|
|
list_del(&dsc->others); /* unhook from list */
|
|
YFREE(dsc);
|
|
yaffsfs_Unlock();
|
|
return 0;
|
|
}
|
|
|
|
// end of directory stuff
|
|
|
|
|
|
int yaffs_symlink(const char *oldpath, const char *newpath)
|
|
{
|
|
yaffs_Object *parent = NULL;
|
|
yaffs_Object *obj;
|
|
char *name;
|
|
int retVal= -1;
|
|
int mode = 0; // ignore for now
|
|
|
|
yaffsfs_Lock();
|
|
parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
|
|
obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath);
|
|
if(obj)
|
|
{
|
|
retVal = 0;
|
|
}
|
|
else
|
|
{
|
|
yaffsfs_SetError(-ENOSPC); // just assume no space for now
|
|
retVal = -1;
|
|
}
|
|
|
|
yaffsfs_Unlock();
|
|
|
|
return retVal;
|
|
|
|
}
|
|
|
|
int yaffs_readlink(const char *path, char *buf, int bufsiz)
|
|
{
|
|
yaffs_Object *obj = NULL;
|
|
int retVal;
|
|
|
|
|
|
yaffsfs_Lock();
|
|
|
|
obj = yaffsfs_FindObject(NULL,path,0);
|
|
|
|
if(!obj)
|
|
{
|
|
yaffsfs_SetError(-ENOENT);
|
|
retVal = -1;
|
|
}
|
|
else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK)
|
|
{
|
|
yaffsfs_SetError(-EINVAL);
|
|
retVal = -1;
|
|
}
|
|
else
|
|
{
|
|
char *alias = obj->variant.symLinkVariant.alias;
|
|
memset(buf,0,bufsiz);
|
|
strncpy(buf,alias,bufsiz - 1);
|
|
retVal = 0;
|
|
}
|
|
yaffsfs_Unlock();
|
|
return retVal;
|
|
}
|
|
|
|
int yaffs_link(const char *oldpath, const char *newpath)
|
|
{
|
|
// Creates a link called newpath to existing oldpath
|
|
yaffs_Object *obj = NULL;
|
|
yaffs_Object *target = NULL;
|
|
int retVal = 0;
|
|
|
|
|
|
yaffsfs_Lock();
|
|
|
|
obj = yaffsfs_FindObject(NULL,oldpath,0);
|
|
target = yaffsfs_FindObject(NULL,newpath,0);
|
|
|
|
if(!obj)
|
|
{
|
|
yaffsfs_SetError(-ENOENT);
|
|
retVal = -1;
|
|
}
|
|
else if(target)
|
|
{
|
|
yaffsfs_SetError(-EEXIST);
|
|
retVal = -1;
|
|
}
|
|
else
|
|
{
|
|
yaffs_Object *newdir = NULL;
|
|
yaffs_Object *link = NULL;
|
|
|
|
char *newname;
|
|
|
|
newdir = yaffsfs_FindDirectory(NULL,newpath,&newname,0);
|
|
|
|
if(!newdir)
|
|
{
|
|
yaffsfs_SetError(-ENOTDIR);
|
|
retVal = -1;
|
|
}
|
|
else if(newdir->myDev != obj->myDev)
|
|
{
|
|
yaffsfs_SetError(-EXDEV);
|
|
retVal = -1;
|
|
}
|
|
if(newdir && strlen(newname) > 0)
|
|
{
|
|
link = yaffs_Link(newdir,newname,obj);
|
|
if(link)
|
|
retVal = 0;
|
|
else
|
|
{
|
|
yaffsfs_SetError(-ENOSPC);
|
|
retVal = -1;
|
|
}
|
|
|
|
}
|
|
}
|
|
yaffsfs_Unlock();
|
|
|
|
return retVal;
|
|
}
|
|
|
|
int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev);
|
|
|
|
int yaffs_DumpDevStruct(const char *path)
|
|
{
|
|
char *rest;
|
|
|
|
yaffs_Object *obj = yaffsfs_FindRoot(path,&rest);
|
|
|
|
if(obj)
|
|
{
|
|
yaffs_Device *dev = obj->myDev;
|
|
|
|
printf("\n"
|
|
"nPageWrites.......... %d\n"
|
|
"nPageReads........... %d\n"
|
|
"nBlockErasures....... %d\n"
|
|
"nGCCopies............ %d\n"
|
|
"garbageCollections... %d\n"
|
|
"passiveGarbageColl'ns %d\n"
|
|
"\n",
|
|
dev->nPageWrites,
|
|
dev->nPageReads,
|
|
dev->nBlockErasures,
|
|
dev->nGCCopies,
|
|
dev->garbageCollections,
|
|
dev->passiveGarbageCollections
|
|
);
|
|
|
|
}
|
|
return 0;
|
|
}
|